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Sublethal effects of lufenuron on the diamondback moth, Plutella xylostella (Linnaeus)

Published online by Cambridge University Press:  19 September 2011

Anureet Josan  and
Gursharan Singh
Anureet Josan
Affiliation:
Department of Entomology, Punjab Agricultural University, Ludhiana-141 004 (Pb.), India
Gursharan Singh*
Affiliation:
Department of Entomology, Punjab Agricultural University, Ludhiana-141 004 (Pb.), India
*
* Corresponding author: GS. E-mail: [email protected]
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Abstract

Lufenuron, N–[2, 5–dichloro–4–(1, 1, 2, 3, 3, 3– hexafluoropropoxy) –phenylaminocarbonyl]–2, 6–difluorobenzamide, a novel acylurea insect growth regulator, exerted significant sublethal effects in larvae, pupae and adults of the diamondback moth, Plutella xylostella (Linnaeus) (Lepidoptera: Plutellidae). Second, third and fourth instars were treated at their respective LCM using a standard 'leaf–disc dip' method of bioassay. Sizes and weights of pupae from the treated lots were significantly reduced but larval and pupal durations remained unaffected. All the pupae formed from larvae treated as fourth instars were deformed and produced no adults. Only 38 and 14% of adults emerged from the pupae formed following treatment at the second and third instar, respectively, as compared to 88–92% adult emergence in the controls. Apart from significant reduction in body length, some adults from the treatments had fringed and twisted wings which prevented normal flight. IGR treatment also resulted in pronounced reduction in fecundity (up to 10.2 eggs per female in comparison with 135.8 per female in the control) and oviposition periods (up to 3.2 days in comparison to 7.8 days in the control). Field trials to investigate the management of P. xylostella using lufenuron are recommended.

Keywords

lufenuroninsect growth regulator (IGR)diamondback mothPlutella xylostellasublethal effectslufenuronrégulateur de croissance d'insecteteigne (Plutella xylostella)effet sous–létal
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 20 , Issue 4 , December 2000 , pp. 303 - 308
Copyright
Copyright © ICIPE 2000

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